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Performing a WHOIS and a Reverse DNS yields the following email addresses associated to their respective IP/CIDR Ranges:

Note to Postmaster

This note will be sent to all of the above Postmaster emails.

Return Path operates the Official Feedback Loop Service for Comcast. Comcast offers this service, free of charge, to parties sending large amounts of mail to Comcast members. The feedback loop (FBL) will forward any mail reported as spam originating from the associated IP addresses back to the listed email address. We highly recommend the use of a dedicated e-mail address for this purpose.

A confirmation email will be sent to the contact email address you specify below. Once your request has been approved, Feedback Loop email will be sent to the email address listed in the "Feedback Loop Email" field.